[Report of the Medical Officer of Health for London County Council] page -

London County Council 1900

[Report of the Medical Officer of Health for London County Council]

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Table: Table V.—Averages ok the Figures relating to the rapid Sedimentation and subsequent Bacterial Treatment of Crude Sewage in a Fine Coke-bed at the Northern Outfall "Works. (Series III.)All quantities, except where otherwise stated, are expressed in parts per 100,000.

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Table V.—Averages ok the Figures relating to the rapid Sedimentation and subsequent Bacterial Treatment of Crude Sewage in a Fine Coke-bed at the Northern Outfall "Works. (Series III.)

All quantities, except where otherwise stated, are expressed in parts per 100,000.

Date.	Solids in suspension.	Oxygen absorbed from permanganate in 4 hours at 80° Fahr.		Nitrous Nitrogen.	Nitric Nitrogen.
Date.	Solids in suspension.	By crude liquid. (Total putrescible matter.)	By clear liquid. (Dissolved putrescible matter.)	Nitrous Nitrogen.	Nitric Nitrogen.
1900.	Crude sewage as supplied to the settling tank B.
November	65.9	14.028	7.940	0.0020	0.0042
December	76.1	13.418	7.118	0.0086	Nil
Average for 1900	71.3	13.702	7.509	0.0055	0.0020
1901.
January	73.4	13.459	7.279	0.0119	0.0411
February	71.3	13.244	7.267	0.0422	0.1658
March	70.3	12.862	7.100	0.0118	0.0861
April	54.0	11.166	5.711	0.0297	0.0121
May	64.9	12.679	6.170	Nil	Nil
June	59.9	12.529	5.700	Nil	Nil
July	63.7	11.690	5.462	0.0013	Nil
August	70.7	13.659	6.993	Nil	Nil
Average for 1901	65.8	12.574	6.397	0.0121	0.0414
Average for the whole period	67.0	12.829	6.648	0.0106	0.0326
1900.	Settled sewage as supplied to coke.bed B.
November	15.4	8.410	6.026	0.0021	0.1123
December	15.6	8.000	5.655	0.0023	0.2824
Average for 1900	15.5	8.190	5.827	0.0022	0.2036
1901.
January	16.4	8.252	5.695	Nil	0.3750
February	14.0	8.529	6.318	0.0139	0.2232
March	12.4	7.666	5.693	0.0026	0.1321
April	11.6	7.192	4.757	Nil	0.0302
May	6.4	7.419	5 028	Nil	0.0473
June	8.4	8.224	5.034	Nil	Nil
July	22.0	9.829	4.252	0.0013	Nil
August	16.7	9.411	3.594	Nil	Nil
Average for 1901	13.5	8.248	5.203	0.0023	0.1115
Average for the whole period	13.9	8.235	5.341	0.0022	0.1319
1900.	Effluent f rom coke.bed B.
November	4.0	3.801	3 .096	0.0537	2.144
December	3 .0	3.609	2.891	0.0196	1.824
Average for 1900	3.5	3.698	2.986	0.0354	1.972
1901.
January	3.3	3.659	2.976	0.0274	1.2485
February	2.2	3.471	2.800	0.0789	0.1223
March	1.2	3.253	2.792	0.0440	1.0389
April	3.9	2.942	2.358	0.1416	0.8064
May	2.5	2.860	2.398	0.0890	1.7668
June	4.6	3.688	2.328	0.0722	0.2372
July	4.0	2.996	1.991	002.22	1.3551
August	4./	2.417	1.568	0.0433	1.7209
Average for 1901	3.1	3.262	2.495	0.0628	1.0997
Average for the whole period	3.2	3.358	2.604	0.0567	1.2931
Average percentage purification of the crude sewage during the whole period	95.2	73.8	60.8	—	—